From: "John Miles" <[EMAIL PROTECTED]> Subject: [time-nuts] Wavecrest noise measurement hardware Date: Wed, 25 Apr 2007 11:43:30 -0700 Message-ID: <[EMAIL PROTECTED]>
> As an aside, how do the Wavecrest machines work? Do they just run the > signal into a low-jitter ADC with a high-quality clock and derive all the > timing information digitally, or is the box full of low-noise tunable > synthesizers, mixers, filters, and the usual stuff? It is a fairly traditional design in which they have a coarse clock (100 MHz for the DTS-207X and 200 MHz for the SIA-3000), generate an error signal which charge a capacitor and then A/D convert the accumulated voltage into digital. They have a patent from the DTS-207X days which should give you more than enought feeling of how it works. ;) Cheers, Magnus _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
